Forced boiling of nonazeotropic immiscible mixture in a supercapillary microchannel array for ultra-high heat flux removal with chip junction temperature below 85℃  

作　　者：SUN Bo BAO YuChen TIAN Tong LI Ji 

机构地区：[1]School of Engineering Science,University of Chinese Academy of Sciences,Beijing,100049,China [2]Laboratory of Advanced Thermal Management Technologies,School of Engineering Science,University of Chinese Academy of Sciences,Beijing,100049,China

出　　处：《Science China(Technological Sciences)》2024年第5期1364-1380,共17页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51776195)。

摘　　要：In this study,a structure-optimized two-phase microchannel heat sink with sintered submicron nucleation sites was developed and tested.The copper-based microchannels had a rectangular cross-section with an equivalent hydraulic diameter of 222μm.The subcooled flow boiling characteristics were comprehensively compared between pure HFE-7100 and a non-azeotropic,immiscible binary mixture of HFE-7100 and water,considering heating areas of 1 and 5 cm^(2).The total heating power input to the test section were 100–1500 and 250–3000 W for a 1 and 5 cm^(2)heat source,respectively,with a flow rate ranging from 50 to150 L/h.Compared to pure HFE-7100,the non-azeotropic immiscible binary mixture of HFE-7100/water in the sintered porous microchannels exhibited a much higher overall heat transfer coefficient and lower power consumption.To maintain the junction temperature of a high power electronic chip below 85℃,the proposed supercapillary microchannel heat sink could effectively dissipate the heat flux of 1275 W/cm^(2)over 1 cm^(2)heat source and 500 W/cm^(2)over 5 cm^(2)heat source.In addition,the volume ratio of the binary mixture strongly influence the two-phase flow heat transfer characteristics.An optimal volume ratio exist in terms of the thermal resistance–pumping power minimization(HFE-7100:water=2:8 is recommended in this study).The findings of this investigation on the flow boiling properties of non-azeotropic immiscible mixtures help fill a gap in the related field.

关 键 词：MICROCHANNEL sintered powder coating submicron nucleation cavities nonazeotropic immiscible ultra-high heat flux 

分 类 号：TN40[电子电信—微电子学与固体电子学] TK124[动力工程及工程热物理—工程热物理]